avassetexportsession

I know this question was asked before (for example here and here ) but I just can't figure out what I'm doing wrong. I have an AVMutableComposition that I use to combine some video clips with some CALayer s that animate on top of them. Everything works ok when I take my AVMutableComposition and combine it with an AVSynchronizedLayer for playback inside an AVPlayerLayer . The video comes out correctly and everything is positioned where it should. My problem is that when I tried to export this thing I tried using AVVideoCompositionCoreAnimationTool instead of AVSynchronizedLayer (that's what the

I am capturing the video using UIImagePickerController, i can crop the video using the following code, AVAsset *asset = [AVAsset assetWithURL:url]; //create an avassetrack with our asset AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; //create a video composition and preset some settings AVMutableVideoComposition* videoComposition = [AVMutableVideoComposition videoComposition]; videoComposition.frameDuration = CMTimeMake(1, 30); //here we are setting its render size to its height x height (Square) videoComposition.renderSize = CGSizeMake

I am using AVCaptureMovieFileOutput to record some video. I have the preview layer displayed using AVLayerVideoGravityResizeAspectFill which zooms in slightly. The problem I have is that the final video is larger, containing extra image that didn't fit on the screen during preview. This is the preview and resulting video Is there a way I can specify a CGRect that I want to cut from the video using AVAssetExportSession ? EDIT ---- When I apply a CGAffineTransformScale to the AVAssetTrack it zooms into the video, and with the AVMutableVideoComposition renderSize set to view.bounds it crops off

AVPlayer will randomly just play audio, not showing the video track... Playing video correctly with AVPlayer while having an active compression session of AVAssetExportSession:exportAsynchronouslyWithCompletionHandler is now failing. It seems it causes some instability that persists until the app goes into the background and comes back. Examining AVURLAsset when video playback fails, there is a video track even though there is no video output. I also don't get any errors from the compressor or the other playback components... The problem happens even for a while after the compression session